This is currently on order (5-7 days). It's certainly worth putting an order in when these films total up to £2 each, DVD.co.uk are a good company and will send it asap.
Next best price = Forget The Rest @£7.69
IMDb ratings --
Pitch Black: 6.7/10 (30,507 votes)
Doom: 5.2/10 (20,771 votes)
Chronicles of Riddick: 6.3/10 (25,071 votes)
"Pitch Black: The daylight can burn you, but the darkness will kill you! Experience the psychological terror when a group of marooned passengers must face a pack of terrifying creatures whose only weakness is the light. With little power and dwindling numbers, the doomed passengers turn to a vicious convict (Vin Diesel) with an appetite for destruction and eerie eyes that can guide them through the darkness...
The Chronicles of Riddick: The wanted criminal Riddick arrives in Helion Prime and finds himself against the invading Necromongers, an army that plans to convert or kill all humans...
Doom: No one gets out alive!
Based on the hugely popular video game, Doom is an explosive action-packed thrill ride!
A frantic call for help from a remote research station on Mars sends a team of mercenary Marines into action. Led by The Rock and Karl Urban, they descend into the Olduvai Research Station, where they find a legion of nightmarish creatures, lurking in the darkness, killing at will. Once there, the Marines must use an arsenal of firepower to carry out their mission: nothing gets out alive."